I bought this car last November but have only recently got her in traveling shape. I would crank her every so often but would mostly have to charge the battery first. I have finally narrowed down the battery drain problem when I finally noticed the following odd behavior. The Becker radio doesn't work but every 30 seconds or so I can hear a relay engaging and a scratching sound come from the driver's side dash speaker. This is without the key even in the ignition. I have made sure the antenna control is in the off position so the antenna motor doesn't run. Does this sound like it could be anything else besides a dead radio still operating a relay with all the power off? Thanks for any help.

Jerry